Chattermint
Built at Zero to Agent: Vercel x Deepmind Hackathon NYC · Mar 21, 2026 · New York, NY

Everyone has an accent. Chattermint lets you control yours. 750 million people want to change how they sound in English, from actors learning dialects to remote workers judged by their voice on Zoom, immigrants tired of being asked "where are you from?", public speakers refining their delivery, and podcasters and YouTubers who know their voice is their brand. But dialect coaches cost $200/hr, Duolingo gives binary right/wrong, and YouTube tutorials offer zero feedback. Chattermint is an AI accent coach that gives you a mirror for your voice. Watch a famous speech (MLK, Steve Jobs, Emma Watson), record yourself matching their delivery, and get phoneme-level feedback powered by wav2vec2 articulatory distance scoring that tells you not just what's wrong, but how far off each sound is and what to move in your mouth. Gemini Flash detects your accent from your phoneme patterns and acts as an agentic coach, identifying your weakest sounds, building a personalized practice sequence, and adapting as you improve. The stack that makes this possible (real-time phoneme recognition, LLM articulation coaching via Vercel AI SDK, instant reference audio from ElevenLabs, Supabase for progress tracking, and edge GPU inference on Modal) only became affordable in the last year, arriving just as remote work turned your voice into your professional presence and the creator economy made everyone care about how they sound. Your accent, your choice.